54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/sysmacros.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#define xmknod(path, mode, maj, min) \
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if (mknod(path, mode, makedev(maj, min)) < 0) exit(255);
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// Too early for console logs (/dev/console is created here!), so we have to resort to exiting with a weird exit code in
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// case of failure.
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static void populate_devfs()
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{
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if (mkdir("/dev", 0755) < 0 && errno != EEXIST) exit(255);
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xmknod("/dev/console", 0666, 1, 0);
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xmknod("/dev/null", 0666, 2, 0);
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xmknod("/dev/zero", 0666, 2, 1);
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}
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int main()
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{
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if (getpid() != 1)
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{
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fprintf(stderr, "error: init not running as PID 1.\n");
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return 1;
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}
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populate_devfs();
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// Before this point, we don't even have an stdin, stdout and stderr. Set it up now so that child processes (and us)
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// can print stuff.
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stdin = fopen("/dev/console", "r");
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stdout = fopen("/dev/console", "w");
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stderr = fopen("/dev/console", "w");
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pid_t ret = fork();
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if (ret == 0)
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{
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char* argv[] = { "/bin/sh", NULL };
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char* envp[] = { "PATH=/bin:/sbin", NULL };
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execve(argv[0], argv, envp);
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perror("execv");
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return 1;
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}
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while (1) wait(NULL);
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}
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